Riding lawnmower



FIG. 1 is a top plan view of a riding lawnmower, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left, front perspective view thereof;

FIG. 7 is a right, front perspective view thereof; and,

FIG. 8 is a right, rear perspective view thereof. 

The ornamental design for a riding lawnmower, as shown and described. 